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Full Discussion: How to get CRC check sum of files in java EAR file without extracting .jar/.war files to disk.?
Top Forums Shell Programming and Scripting How to get CRC check sum of files in java EAR file without extracting .jar/.war files to disk.? Post 302968669 by kchinnam on Sunday 13th of March 2016 12:17:04 AM
Old 03-13-2016
How to get CRC check sum of files in java EAR file without extracting .jar/.war files to disk.?
unzip -v gives CRC info of each file in a zip(in my case .EAR) file.

Code:
# unzip -v my-application.ear
Archive:  my-application.ear
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
  197981  Defl:N   183708   7% 2016-03-10 19:01 90fbac01  file-core.jar
  210547  Defl:N   196091   7% 2016-03-10 19:01 b021ffd8  utilcommon.jar
.......

I am trying to compare two large EAR files, that contain around 200 .jar, .war files.

Is there a way to get CRC check sum values for files(like .class, .properties) without extracting underlying .jar/.war files from java EAR file?

Extracting hundreds of jar war files to disk to get CRC values is very slow and time consuming. Any other ideas to make it fast?
 

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LEARN ABOUT DEBIAN

jh_generateorbitdir

JH_GENERATEORBITDIR(1)						    Javahelper						    JH_GENERATEORBITDIR(1)

NAME

       jh_generateorbitdir - Creates and populates an orbit dir used by pde-build for third-party jar files.

SYNOPSIS

       jh_generateorbitdir [debhelperoptions] [--orbit-dir=dir] [orbit-dep[...]]

DESCRIPTION

       jh_generateorbitdir is a javahelper program that handles creation of an orbit dependency dir. This directory has to be populated with non-
       eclipse jar files. However, eclipse refers to these jars by their "symbolic name". jh_generateorbitdir can extract this name from the jar's
       manifest (provided it has the OSGi metadata) and create a symlink to it.

       jh_generateorbitdir will replace regular files with symlinks if they are present in the orbit dir and clash with the name of one of the
       orbit jars. If an orbit jar name clashes with a symlink in the orbit dir, then jh_generateorbitdir will assume that the given jar has
       already been symlinked correctly. In this case the jar file is still recorded in the cache (see below).

       jh_generateorbitdir will also check the default installation for jar files on Debian systems (at the time of writing /usr/share/java), if
       it cannot find the jar in the current dir.

       Jar files replaced by jh_generateorbitdir will be recorded so that jh_installeclipse can replace with symlinks them post install.

FILES

       debian/eclipse.orbitdeps
	   List of orbit dependencies - one per line. This can be used as an alternative to passing it per command line.

OPTIONS

       --orbit-dir=dir
	   Specifies the directory from where the orbit-dir is or should be created. Defauls to "debian/.eclipse_build/orbitdeps".

EXAMPLE

	 jh_generateorbitdir --orbit-dir orbit asm3 oro

       Will generate a folder called orbit with two symlinks based on asm3 and oro's symbolic name.

SEE ALSO

       debhelper(7)

       This program is a part of javahelper and uses debhelper as backend. There are also tutorials in /usr/share/doc/javahelper.

AUTHOR

       Niels Thykier <niels@thykier.net>

COPYRIGHT AND LICENSE

       Copyright 2010 by Niels Thykier

       This tool is free software; you may redistribute it and/or modify it under the terms of GNU GPL 2.

0.43								    2011-04-29						    JH_GENERATEORBITDIR(1)
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